Universal precision sharpening machine



Dec. 18, 1945. G. GROBET 2,391,153

UNIVERSAL PRECISION SHARPENING MACHINE Filed July 31, 1945 3 Sheets-Sheet} I Bu 9 l n I u- Dec. 18, 1945. G GR OBET 2,391,153

I UNIVERSAL PRECISION SHARBEN ING MACHINE Filed July 31, 1945 s Sheets-Sheet 2 Dec. 18, 1945. G.- GROBET I UNIVERSAL FRECISION SHARPENING MACHINE I 3 Sheets-Sheet a File July 31', 1945 'Z'v 812x64??? 1 0562; W

Patented Dec. 18, 1945 umvmtsnirmclsmicsnnnmma Georges Groli'ehGeneva, SwitzerlauiaSsfgnoirto I ltoliertlfafiib' Genevalswitzerfandi v,

: Ap fimsmmyn, mama-Mm 5''(llaims. fmmfobje'ct of the presemainventiorris; aunt .versaliprecisiom sharpening machine: 3",WG1lk--tab1e%'m0ving longitudinally; and: a slid;-

ing grinding-wheel. support. moving; transversely. This sharpening machine is characterized in that lm stwitzenland 2 1 the'work table rests? on a rigid bed having the shape of abridge with two pillars and mounted on a common frame, and in that the sliding support rests on a transverseslide provided on this frame between the 'two pillars and extending backwards from the latters, the forepart of the sliding support engaging itself freely under the middle part of the bed, the whole in such a way as to'eliminate any risk of error resulting from elastic deformation of the moving elements or of their support.

The attached drawings represent schematically, by way of example, an embodiment of the sharpening machine making the object of the invention. Fig. 1 is an elevation and Fig. 2 a side View thereof. section, the left and right half of which correspond respectively to the lines A-A and B-B of Fig. 2. Fig. 4 is a partial transverse section according to line CC of Fig. 3. r

In the embodiment represented, the machine comprises a frame I possessing on the one hand a transverse slide 2 and on the other hand a longitudinal bed in the shape of a bridge with two pillars 3, onwhich moves a work-table 4. The latter is controlled by a hand-wheel 5. The slide 2 carries a slider I on which is mounted a grinding-wheel supporting column 8. This slide extends as far as the front of the machine, the forepart of the slider having free passage between the two pillars under the middle part of the bed of the work-table. The slider can be controlled with precision by the hand-wheels 9 and 9 with micrometrical division, and a lever I is provided for quick displacements. A handle I I permits to pass from one to the other of these two means of control.

The lever Ill drives a shaft I2, shown on Fig. 3, which carries a fixed toothed wheel I3 driving in its turn a. pinion that is itself fixed on a toothed wheel I4; the latter can rotate freely on a pivot mounted in the frame and engages into a rack I5 fixed on the slider. The handle II extends into the frame through an axis IS, the other end of wlhich carries a small eccentric. The latter fits in an eyelet ll of a bolt, whose square head can slip along a groove provided in an oblong nut I8, which itself can slide along a v provided in the transverse slide.

The control hand-wheels 9 and 9' are mounted Fig. 3 is a partial longitudinal rat oneendz. of. armicrometri cali screw- -Iz91 comounted on a thrust ball-bearing.

A hand-wheel 26 with micrometrical graduation is mounted rotatably on the slider by means of an axis, the other end of which carries a toothed wheel 21. The latter engages on the one hand into the pinion 25 and on the other hand into an intermediate pinion 28 driven by a pinion 29. This pinion is mounted at the end of the axis of a knob 30 intended to control the accurate vertical displacements of the grinding-wheel support. 7 The quick displacement of the latter is insured by the handle 3I mounted directly on the hand-wheel 26.

' The operation of the machine is as follows:

The cutters of other tools to be sharpened are disposed on the work-table by means of accessothe organs 30 and 3| controlling the vertical adjustment device of the grinding-wheel has the advantage of making them accessible from both sides of the machine.

The chief advantage of this sharpening machine is to possess a Work-table that is particularly well supported by a bed of very stiff shape leaving free passage for the sliding grindingwheel support; this latter is mounted on the same frame as the bed, so that the relative position of the grinding-wheel with respect-to the piece to be sharpened can be determined with, a high accuracy and that any risk of error due to elastic deformation of the movable elements or of their support is completely eliminated. I

It is obvious that the invention is not limited bed, a sliding support movable transversely of the frame and having a portion adapted to move through the space beneath the bed and between the pillars, means including a rack for quick displacement of said support, means including a micrometrical screw for fine adjustments of the support, and a grinding wheelcolumn carried by and vertically adjustable relative to said support.

2. A universal precision machine comprising,

a frame having a transverse slideway extending thereacross, a bed at the front, of the frame in the form of a bridge having spaced pillars rigidly mounted on the frame on opposite sides of the slideway, a work table mounted on and movable longitudinally of the bed, a sliding support movgtheslideway and provided with a groove, a micrometrical screw coacting with the nut and opable along the slideway transversely of the fram and having the forward portion movable through the space beneath the bridge and betweenthe pillars and having the rear portion extending rearwardly of the bed, a grinding wheel support carried by and vertically adjustable relative to the rear portion of the sliding support, and the parts being arranged to eliminate any risk of error'resulting from elastic deformation of the moving elements or their support.

erable from either end of the slideway, and a locking device including a bolt engaging with the groove provided in the nut, substantially as and for the purposes set forth.

5. "A'machine according to claim 2, in which the means for mounting the grinding wheel support includes a muff fixed on the slideway, a sleeve slidably mounted in the mufi, a vertical column forming the support rotatably arranged in the sleeve, and means for effecting quick and accurate displacements of the sleeve.

GEORGES GROBET.. 

